Rudolf Horvat (14 March 1873 – 25 May 1947) was a Croatian historian. Horvat was born in Koprivnica, and graduated from the University of Zagreb in history and geography in 1896, as well as law in 1918. He worked as a history teacher at the Real Gymnasium Osijek, and in Zemun, Petrinja and Zagreb secondary schools before and during the World War I. During the war, Horvat was accused of being sympathetic to the Kingdom of Serbia and briefly detained in Hungary in response. After the establishment of the new South Slavic state, the Kingdom of Serbs, Croats and Slovenes (later renamed Yugoslavia)